Heat exchanger for quenching reaction gas

Abstract

Heat exchanger for quenching reaction gas comprising—a coolable double-wall tube including an inner tubular wall and an outer tubular wall, wherein said inner tubular wall is configured to convey said reaction gas to be quenched, and wherein a space defined by said inner tubular wall and said outer tubular wall is configured to convey a coolant; —a tubular connection member having a bifurcating longitudinal cross-section comprising an exterior wall section and an interior wall section defining an intermediate space filled with refractory filler material, wherein a converging end of said connection member is arranged to be in connection with an uncoolable reaction gas conveying pipe, wherein said exterior wall section is connected with said outer tubular wall of said coolable double-wall tube, wherein an axial gap is left between said interior wall section and said inner tubular wall of said coolable double-wall tube.

The invention claimed is: 
     
       1. Heat exchanger for quenching reaction gas comprising:
 a coolable double-wall tube including an inner tubular wall and an outer tubular wall, wherein said inner tubular wall is configured to convey said reaction gas to be quenched, and wherein a space defined by said inner tubular wall and said outer tubular wall is configured to convey a coolant; 
 a tubular connection member having a bifurcating longitudinal cross-section comprising an exterior wall section and an interior wall section defining an intermediate space filled with refractory filler material, wherein a converging end of said connection member is arranged to be in connection with an uncoolable reaction gas conveying pipe, wherein said exterior wall section is connected with said outer tubular wall of said coolable double-wall tube, wherein an axial gap is left between said interior wall section and said inner tubular wall of said coolable double-wall tube; and 
 a sealing member configured to seal said axial gap between said interior wall section and said inner tubular wall of said coolable double-wall tube; 
 
       wherein an edge of said inner tubular wall engaging said sealing member comprises an at least partly beveled edge including a bevel engaging said sealing member. 
     
     
       2. Heat exchanger according to  claim 1 , wherein said sealing member comprises slidingly overlapping thinned ends. 
     
     
       3. Heat exchanger according to  claim 1 , wherein said sealing member comprises a spring-like element arranged to press said sealing member against said at least partly beveled edge of said inner tubular wall. 
     
     
       4. Heat exchanger according to  claim 1 , wherein said edge of said inner tubular wall is beveled radially inwardly. 
     
     
       5. Heat exchanger according to  claim 1 , wherein an edge of said interior wall section engaging said sealing member comprises a partly beveled edge including a bevel radially spaced apart from, and substantially in parallel with, said at least partly beveled edge of said end side of said inner tubular wall. 
     
     
       6. Heat exchanger according to  claim 5 , wherein said sealing member engages an unbeveled part of said partly beveled edge of said interior wall section of said tubular connection member. 
     
     
       7. Heat exchanger according to  claim 1 , wherein said refractory filler material comprises at least two sectors of refractory filler material separated by at least two slits extending in an axial and a radial direction. 
     
     
       8. Heat exchanger according to  claim 7 , wherein said at least two slits comprise a layer of ceramic paper. 
     
     
       9. Heat exchanger according to  claim 1 , wherein a layer of ceramic paper is comprised between said refractory filler material and said exterior wall section of said tubular connection member. 
     
     
       10. Heat exchanger according to  claim 1 , wherein said refractory filler material comprises in an axial direction at least two layers of refractory filler material with different heat conductivity, wherein the heat conductivity of said at least two layers of refractory filler material decreases towards said coolable double-wall tube. 
     
     
       11. Heat exchanger according to  claim 1 , wherein said outer tubular wall of said coolable double-wall tube is at least partly made of manganese and/or molybdene. 
     
     
       12. Heat exchanger according to  claim 1 , wherein said coolable double-wall tube comprises a coolant inlet nozzle arranged to let a coolant into said space defined by said inner tubular wall and said outer tubular wall of said coolable double-wall tube at a bottom level of said coolable double-wall tube close to said tubular connection member. 
     
     
       13. Heat exchanger according to  claim 12 , wherein said coolant inlet nozzle is included in a coolant box extending between said outer tubular wall of said coolable double-wall tube and said exterior wall section of said tubular connection member and surrounding said inner tubular wall of said coolable double-wall tube. 
     
     
       14. Heat exchanger according to  claim 1 , comprising at least one baffle arranged to guide a flow of coolant in said space defined by said inner tubular wall and said outer tubular wall of said coolable double-wall tube. 
     
     
       15. Heat exchanger according to  claim 14 , wherein said at least one baffle is fixedly connected with an outside of said inner tubular wall of said coolable double-wall tube. 
     
     
       16. Heat exchanger according to  claim 1 , wherein said at least one baffle extends into a direction of said coolant inlet nozzle. 
     
     
       17. Heat exchanger according to  claim 16 , wherein said at least one baffle is off-centered with respect to a central axis of said coolant inlet nozzle. 
     
     
       18. Heat exchanger according to  claim 14 , comprising at least two mutually transversally positioned baffles. 
     
     
       19. Heat exchanger for quenching reaction gas comprising:
 a coolable double-wall tube including an inner tubular wall and an outer tubular wall, wherein said inner tubular wall is configured to convey said reaction gas to be quenched, and wherein a space defined by said inner tubular wall and said outer tubular wall is configured to convey a coolant; 
 a tubular connection member having a bifurcating longitudinal cross-section comprising an exterior wall section and an interior wall section defining an intermediate space filled with refractory filler material, wherein a converging end of said connection member is arranged to be in connection with an uncoolable reaction gas conveying pipe, wherein said exterior wall section is connected with said outer tubular wall of said coolable double-wall tube, wherein an axial gap is left between said interior wall section and said inner tubular wall of said coolable double-wall tube; and 
 a sealing member configured to seal said axial gap between said interior wall section and said inner tubular wall of said coolable double-wall tube; 
 
       wherein said refractory filler material comprises at least two sectors of refractory filler material separated by at least two slits extending in an axial and a radial direction. 
     
     
       20. Heat exchanger according to  claim 19 , wherein said at least two slits comprise a layer of ceramic paper. 
     
     
       21. Heat exchanger according to  claim 19 , wherein a layer of ceramic paper is comprised between said refractory filler material and said exterior wall section of said tubular connection member. 
     
     
       22. Heat exchanger according to  claim 19 , wherein said refractory filler material comprises in an axial direction at least two layers of refractory filler material with different heat conductivity, wherein the heat conductivity of said at least two layers of refractory filler material decreases towards said coolable double-wall tube. 
     
     
       23. Heat exchanger for quenching reaction gas comprising
 a coolable double-wall tube including an inner tubular wall and an outer tubular wall, wherein said inner tubular wall is configured to convey said reaction gas to be quenched, and wherein a space defined by said inner tubular wall and said outer tubular wall is configured to convey a coolant; 
 a tubular connection member having a bifurcating longitudinal cross-section comprising an exterior wall section and an interior wall section defining an intermediate space filled with refractory filler material, wherein a converging end of said connection member is arranged to be in connection with an uncoolable reaction gas conveying pipe, wherein said exterior wall section is connected with said outer tubular wall of said coolable double-wall tube, wherein an axial gap is left between said interior wall section and said inner tubular wall of said coolable double-wall tube; 
 a sealing member configured to seal said axial gap between said interior wall section and said inner tubular wall of said coolable double-wall tube; and 
 further comprising at least two mutually transversally positioned baffles arranged to guide a flow of coolant in said space defined by said inner tubular wall and said outer tubular wall of said coolable double-wall tube. 
 
     
     
       24. Heat exchanger according to  claim 23 , wherein at least one baffle is fixedly connected with an outside of said inner tubular wall of said coolable double-wall tube. 
     
     
       25. Heat exchanger according to  claim 23 , wherein said coolable double-wall tube comprises a coolant inlet nozzle arranged to let a coolant into said space defined by said inner tubular wall and said outer tubular wall of said coolable double-wall tube at a bottom level of said coolable double-wall tube close to said tubular connection member. 
     
     
       26. Heat exchanger according to  claim 23 , wherein at least one baffle extends into a direction of said coolant inlet nozzle. 
     
     
       27. Heat exchanger according to  claim 26 , wherein said at least one baffle is off-centered with respect to a central axis of said coolant inlet nozzle.